<template>
  <div id="app" v-cloak>
    <router-view />
  </div>
</template>
<script>
export default {
  created() {
    // 在页面加载时读取sessionStorage里的状态信息
    if (sessionStorage.getItem("store")) {
      this.$store.replaceState(
        Object.assign(
          {},
          this.$store.state,
          JSON.parse(sessionStorage.getItem("store"))
        )
      );
    } // 在页面刷新时将vuex里的信息保存到sessionStorage里 // beforeunload事件在页面刷新时先触发

    window.addEventListener("beforeunload", () => {
      sessionStorage.setItem("store", JSON.stringify(this.$store.state));
    });
  },
};
</script>
<style lang="scss">
#app {
  font-family: Avenir, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  
  color: #2c3e50;
}
body {
  margin: 0;
  height: 100%;
  padding: 0;
}
[v-cloak] {
  display: none;
}
</style>
